I'm working on an Android/iOS OBD app and though we're not launching for a bit, we are releasing some of our backend tools as open source projects, the first of which is an Android OBDII terminal app. We're using it to quickly verify PIDs and Bluetooth connectivity. If you're interested in checking it out the code is here: http://github.com/M-Helm/petrolr_OBDTerminal and I've made an .apk available on our site here: http://petrolr.com/terminal.html.